| Diesels do not need backpressure for the turbo to spool up. Think about it....your exhaust spins the turbo....the faster you can get rid of it...the faster your turbo will spool. I have run my truck with straight pipe (stock exhaust) and now I am running 4" MBRP with a straight through muffler. My turbo spools up pretty fast. The turbo is just a small air compressor.
__________________ 2004 GMC 2500HD D/A CC Carbon Metallic w/ LB7
4" turbo back MBRP exhaust, Cognito UCAs & HD tierods
TST Powermax Programmer, Diablosport Predator
285/75-16 BFG T/A KOs, Eagle Alloys Series 187
Clifford 2 way remote start, High Idle, Bilstein 5100s, 1.5" lift blocks
AFE Magnum Force Stage 2 Proguard 7 intake Waiting install:Rancho Steering stabilizer....all thanks to NorCal Truck  Support your Supporting Vendors |